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x86: make mm/gup.c more virtualization friendly

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Since pte_flags() is much cheaper than pte_val() in some virtualized
environments (namely, Xen), use the former whereever possible.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: "Nick Piggin" <npiggin@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jan Beulich 2008-09-17 16:48:17 +01:00 committed by Ingo Molnar
parent 5e72d9e485
commit 606ee44dbb
2 changed files with 6 additions and 6 deletions
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10
arch/x86/mm/gup.c
View File

@ -82,7 +82,7 @@ static noinline int gup_pte_range(pmd_t pmd, unsigned long addr,
pte_t pte = gup_get_pte(ptep);
struct page *page;
if ((pte_val(pte) & (mask | _PAGE_SPECIAL)) != mask) {
if ((pte_flags(pte) & (mask | _PAGE_SPECIAL)) != mask) {
pte_unmap(ptep);
return 0;
}
@ -116,10 +116,10 @@ static noinline int gup_huge_pmd(pmd_t pmd, unsigned long addr,
mask = _PAGE_PRESENT|_PAGE_USER;
if (write)
mask |= _PAGE_RW;
if ((pte_val(pte) & mask) != mask)
if ((pte_flags(pte) & mask) != mask)
return 0;
/* hugepages are never "special" */
VM_BUG_ON(pte_val(pte) & _PAGE_SPECIAL);
VM_BUG_ON(pte_flags(pte) & _PAGE_SPECIAL);
VM_BUG_ON(!pfn_valid(pte_pfn(pte)));
refs = 0;
@ -173,10 +173,10 @@ static noinline int gup_huge_pud(pud_t pud, unsigned long addr,
mask = _PAGE_PRESENT|_PAGE_USER;
if (write)
mask |= _PAGE_RW;
if ((pte_val(pte) & mask) != mask)
if ((pte_flags(pte) & mask) != mask)
return 0;
/* hugepages are never "special" */
VM_BUG_ON(pte_val(pte) & _PAGE_SPECIAL);
VM_BUG_ON(pte_flags(pte) & _PAGE_SPECIAL);
VM_BUG_ON(!pfn_valid(pte_pfn(pte)));
refs = 0;

2
include/asm-x86/pgtable.h
View File

@ -206,7 +206,7 @@ static inline int pte_exec(pte_t pte)
static inline int pte_special(pte_t pte)
{
return pte_val(pte) & _PAGE_SPECIAL;
return pte_flags(pte) & _PAGE_SPECIAL;
}
static inline unsigned long pte_pfn(pte_t pte)